<?php
    $is_sv = false;
    
    if(isset($_SESSION['s_user'])&&isset($_SESSION['s_pass']))
	{
		$user = $_SESSION['s_user'];
		$t = "GV";
		$k = strpos($user, $t);
		if($k === false)
		{
            $is_sv = true;
        }
    }
?>